Upper Big Nemaha G-25 is a local government-owned earth dam located in Gage, Nebraska, along the TR-MID BR Big Nemaha River. Built in 1968 by the USDA NRCS, this dam stands at a height of 25 feet and has a maximum storage capacity of 178 acre-feet. With a low hazard potential and satisfactory condition assessment, the dam plays a crucial role in flood risk reduction and other purposes in the region.

Managed by the Nebraska Department of Natural Resources, Upper Big Nemaha G-25 is subject to state regulations, permitting, inspection, and enforcement. With a drainage area of 0.7 square miles and a maximum discharge capacity of 340 cubic feet per second, this dam serves as a vital water resource infrastructure for the local community. Its stone core and soil foundation contribute to its structural integrity and overall effectiveness in managing water flow in the area.

Despite its relatively small surface area of 11 acres, Upper Big Nemaha G-25 plays a significant role in water resource management in the region. With its satisfactory condition, low hazard potential, and adherence to state regulations, this earth dam by the Natural Resources Conservation Service continues to provide essential flood risk reduction and water storage capabilities for the community of Adams, Nebraska.